package com.study.util;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

public class ImportExcelUtil {

    private final static String excel2003L = ".xls"; // 2003- 版本的excel
    private final static String excel2007U = ".xlsx"; // 2007+ 版本的excel

    /**
     * 描述：获取IO流中的数据，组装成List<List<Object>>对象
     *
     * @param in ,fileName
     * @return
     * @throws IOException
     */
    public List<List<Object>> getBankListByExcelForGoods(InputStream in, String fileName) throws Exception {
        List<List<Object>> list = null;
        // 创建Excel工作薄
        Workbook work = this.getWorkbook(in, fileName);
        if (null == work) {
            throw new Exception("创建Excel工作薄为空！");
        }
        Sheet sheet = null;
        Row row = null;
        Cell cell = null;

        list = new ArrayList<List<Object>>();
        // 遍历Excel中所有的sheet
        sheet = work.getSheetAt(0);
        // 遍历当前sheet中的所有行
        for (int j = 1; j <= sheet.getLastRowNum(); j++) {
            row = sheet.getRow(j);
            // 遍历所有的列
            List<Object> li = new ArrayList<Object>();
            for (int y = 0; y < row.getLastCellNum(); y++) {
                cell = row.getCell(y);
                li.add(this.getCellValue(cell));
            }
            list.add(li);
        }
        work.close();
        return list;
    }

    /**
     * 描述：根据文件后缀，自适应上传文件的版本
     *
     * @param inStr ,fileName
     * @return
     * @throws Exception
     */
    public Workbook getWorkbook(InputStream inStr, String fileName) throws Exception {
        Workbook wb = null;
        String fileType = fileName.substring(fileName.lastIndexOf("."));
        if (excel2003L.equals(fileType)) {
            wb = new HSSFWorkbook(inStr); // 2003-
        } else if (excel2007U.equals(fileType)) {
            wb = new XSSFWorkbook(inStr); // 2007+
        } else {
            throw new Exception("解析的文件格式有误！");
        }
        return wb;
    }

    /**
     * 描述：对表格中数值进行格式化
     *
     * @param cell
     * @return
     */
    public Object getCellValue(Cell cell) {
        Object value = null;
        if (cell != null) {
            switch (cell.getCellType()) {
                case Cell.CELL_TYPE_STRING:
                    value = cell.getRichStringCellValue().getString();
                    break;
                case Cell.CELL_TYPE_NUMERIC:
                    value = cell.getRichStringCellValue().getString();
                    break;
                case Cell.CELL_TYPE_BOOLEAN:
                    value = cell.getBooleanCellValue();
                    break;
                case Cell.CELL_TYPE_BLANK:
                    value = "";
                    break;
                default:
                    break;
            }
            return value;
        }
        return "";
    }
}